JPH0984975A - Sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a machine easily usable, to facilitate production and to selectively perform desired sewing by performing bisecting into a sewing machine main body and a sewing unit and connecting both. SOLUTION: The sewing machine main body 1 is cut off vertically at a position appropriately shifted to the right from the elevating and lowering position of a needle 4 at the left end part of a bed and a cut-off surface is formed into a connection surface 5. On the connection surface 5, at least the shaft coupling of a lower shaft 6, the shaft coupling of a feed regulation shaft, plural fitting parts 10a and 10b to be fitted to the side of the two sewing units (only a main sewing unit 2 is shown in the figure) and a tightening means for connecting the sewing unit are made to face out freely attachably and detachably to/from respective pair members. As the sewing unit, the main sewing unit 2 and an overlock sewing unit can be connected. In the case of the main sewing unit 2, for a unit body U2, the connection surface 20 with the sewing machine main body 1 is formed on a right end face and the two fitting parts 21a and 21b to be fitted to the fitting parts 10a and 10b on the side of the sewing machine main body are projectingly provided.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a sewing machine,
The bed part of the sewing machine is vertically separated at an appropriate position on the right side of the raising and lowering position of the needle to form the sewing machine main body, and a sewing unit incorporating a needle plate, feed dog, hook or looper, etc. is connected to the bed part of the sewing machine main body. Then, the desired sewing can be performed.

[0002]

2. Description of the Related Art A general sewing machine is divided into, for example, a lock stitch sewing machine capable of selectively performing lock stitching and zigzag stitching, and an overlock sewing machine. Further, for example, Japanese Patent Laid-Open No. 1-166
There is also a composite sewing machine which can be used as both a lockstitch sewing machine and an overlock sewing machine as disclosed in Japanese Patent No. 796.

The above-mentioned conventional composite sewing machine is provided with a shuttle for the lock stitch at the bed portion of the sewing machine, upper and lower loopers for the overlock sewing, and a shuttle drive mechanism and a looper drive mechanism. An operation switching device is attached to the bed portion so that lock stitching and overlock stitching can be selected.

[0004]

Since the former of the above-mentioned conventional sewing machines is for almost a single function, it is necessary to prepare respective models in order to perform various kinds of sewing, and it is necessary to purchase a plurality of sewing machines. I have to.

On the other hand, the latter has a merit that it is cheaper than the former because it is possible to sew a lock stitch and an overlock stitch including a zigzag stitch and a pattern stitch, but various functions are incorporated in a narrow bed. Therefore, there are drawbacks that the structure is complicated, the assembly is difficult, the cost is high, and the functions provided are not easily exhibited.

[0006] Therefore, it is an object to develop a sewing machine which is easy for the user to use, easy to manufacture and hard to break down, so that desired sewing can be selectively performed. Was there.

[0007]

SUMMARY OF THE INVENTION Therefore, according to the present invention, the left side of the bed is separated at the right side of the ascending / descending position of the needle to form a connecting end face, and the connecting end face is provided with a lower shaft coupling and / or a cloth feed adjusting shaft. The sewing machine main body facing the shaft coupling, the fitting portion with the sewing unit, and the connecting portion of the fastening means with the sewing unit, the needle plate, the feed dog, the hook or the looper and the knife mechanism in one body, A cloth feeding mechanism for giving a predetermined feeding operation to the feed dog, a hook or a drive mechanism of a looper and a knife mechanism are incorporated, and the right end face of the body is formed on the connecting end face to be joined to the connecting end face of the sewing machine main body. A shaft coupling that is detachably connected to the shaft coupling of the lower shaft and / or the shaft coupling of the cloth feed adjusting shaft; a fitting portion that is detachably fitted to the fitting portion on the sewing machine main body side; With a coupling part and a coupling part for coupling It is intended to provide an arrangement with sewing machine the manufacturing unit to detachably connected to each other.

[0008]

In the sewing machine of the present invention in which the sewing machine is divided into the sewing machine main body and the sewing unit, desired sewing can be performed only by connecting the sewing unit having a predetermined single function to the sewing machine main body.
Easy for users to use. Since the mechanism is incorporated in the sewing unit for each desired sewing function, the structure is simplified, the manufacturing is facilitated, and troubles and malfunctions are reduced. The present invention has solved the above problems as described above.

According to the present invention, a needle plate, a feed dog, a hook, a cloth feed mechanism for giving a predetermined feed operation to the feed tooth, and a drive mechanism for the hook are incorporated in a sewing unit connected to the sewing machine main body, and the connecting end face of the unit is incorporated. A coupling between the lower shaft shaft joint and the cloth feed adjusting shaft shaft joint, which is detachably connected to the lower shaft shaft joint, and the cloth feed adjusting shaft shaft joint; A normal lockstitch sewing machine can be obtained by using a lockstitch unit provided with a coupling portion and a coupling portion to be connected to a sewing machine main body having a lockstitch function.

Further, a needle plate, a feed dog, a looper and a knife mechanism, a cloth feed mechanism for giving a predetermined feed operation to the feed tooth, a looper drive mechanism, and a knife drive mechanism are incorporated in the sewing unit, and the connection of the unit is performed. On the end surface, a shaft joint that is detachably connected to the shaft joint of the lower shaft, a fitting portion that is detachably fitted to the fitting portion on the sewing machine body side, and a joining portion that is joined to the joining portion of the fastening means. If an overlock sewing unit equipped with is connected to the sewing machine main body equipped with the overlock sewing function, it becomes a normal overlock sewing machine.

The sewing unit is provided with the connecting portion formed on the connecting end face in the form of a check tooth, and the fastening means on the side of the sewing machine body that engages with the connecting portion has the check tooth type connecting portion. A hook-shaped connecting part that hooks is connected to the tip, is horizontally swingable, and has a base end that is exposed to the outer surface of the sewing machine body. And a connecting end surface on the sewing machine main body side by pulling the pulling spring, the pulling spring allowing the elastic passage of the check tooth type connecting portion with respect to the hook type connecting portion in the insertion direction. The connection end faces on the unit side can be attracted to each other to firmly maintain the connection state and facilitate the connection release operation.

Further, on the peripheral surface of the shaft coupling on the lower shaft side of the sewing machine main body, a slit having the lower shaft rotation stop position set to the needle rising position is provided in parallel with the axis line, while the slit is provided along the operation lever. A positioning lever that fits the tip of the slit is provided, the other end of the lever is brought into contact with the operating lever, and a spring is applied between both levers to swing the positioning lever when the operating lever is disengaged. If the stop position of the lower shaft set in this slit is set as the attachment / detachment position of the sewing unit, the attachment / detachment of the sewing unit while the needle is descending is automatically avoided. As a result, the risk of breaking the descending needle is prevented, and the user can use it with confidence.

In the present invention, the shaft coupling on the sewing machine main body and the shaft coupling on the sewing unit side are respectively formed in a disk shape orthogonal to the axis, and the concave groove and the convex groove are formed along the diametrical direction of the joint surfaces. When the rotation of the lower shaft is transmitted to the sewing unit side by meshing with the thread, the sewing unit can be attached / detached to / from the sewing machine main body and the shaft joint can be attached / detached, so that the operability is excellent and the rotational force can be smoothly transmitted.

In the present invention, the fitting portion provided on the sewing machine main body and the fitting portion provided on the sewing unit side have a round cylindrical body with a rounded tip protruding from the connecting end surface on the sewing unit side, and the cylindrical body. And a cylindrical hole provided on the sewing machine main body side with the same diameter as that of the sewing machine, the sewing unit can be easily attached and detached, and rattling can be prevented to further stabilize the sewing.

The sewing machine main body used in the present invention may be a lock stitch sewing machine or an overlock sewing machine. In particular, when a compound sewing machine capable of performing lock stitching, zigzag sewing and overlock sewing is used, A lock stitch unit and an overlock stitch unit can be provided interchangeably,
Various sewing can be performed with one sewing machine, and the advantages of the present invention can be maximized.

In the present invention in which the composite sewing machine is used as the sewing machine main body, the fitting portion of the overlock sewing unit is located at a position different from the fitting portion of the main sewing unit and the fitting portion of the sewing machine main body side. Is provided at the inner end of the fitting portion on the sewing machine main body side, and an abutment that is displaced by fitting of the fitting portion of the overlock sewing unit is provided. , A needle bar that is connected to a stop rod provided adjacent to the needle bar support that gives a swinging width to the needle, and normally urges this stop rod by a spring that biases the stop rod in a direction away from the needle bar support. When the swing lock device is provided, when the overlock sewing unit is connected, the fitting part on the unit side is pushed in against the spring and the blocking rod is advanced to engage the needle bar support and swing the needle. Since it can be fixed so as not to give It is stable over lock sewing.

In the present invention using the composite sewing machine as the sewing machine main body, the sewing machine main body is provided with a needle that vertically moves up and down when viewed from the side in accordance with the lock stitch and the zigzag stitch, and the upper looper of the overlock sewing unit. With the mounting shaft tilted by 20 °, it is possible to smoothly sew lock stitches and zigzag stitches. At the time of overlock stitching, only the upper looper tilts and swings at a specified angle, so smooth sewing is also possible. it can.

In the present invention, the pivot shaft is integrally extended from the lower end of the female mount provided in the overlock sewing unit toward the connection end face side of the sewing machine main body, and the pivot shaft, With the lower edge of the knife cover that also serves as a chip removing chute whose upper side is along the outer surface of the lower knife and is connected so as to move horizontally with the knife mount, the knife cover is attached to the knife as much as possible. Interference with the knife can be avoided by providing chips close to each other to reliably remove chips and move them integrally.

By extending a pivot shaft at the lower end of the female mount,
In the present invention in which the lower edge of the knife cover that also serves as a chip removing chute is pivotally attached, a front cover is provided adjacent to the right side surface of the female cover, the lower edge of which is pivotally attached to the bed by a pivot axis, and is provided on the upper right side of the female cover. By fitting the provided pin into the guide groove provided on the left side surface of the front cover, the female cover can be opened and closed integrally following the opening and closing of the front cover with the pivot shaft as the fulcrum. This facilitates the threading operation when pulling out the looper thread from the thread guide for overlock sewing which is covered with, and then threading the looper thread through the upper and lower loopers located inside the knife mount.

In the sewing machine of the present invention in which an overlock sewing unit is connected as a sewing unit, the upper end surface of the knife mounting base provided in the unit is extended from the moving claw for switching the winding sewing to the front side. Is provided with a support surface of L-shaped cross section for slidably supporting the slidable part, and a holding plate for guiding the sliding part of the moving claw from the open side and the upper surface of the support surface is provided on the left side surface of the female mounting base. Mounting hole on the sliding surface of the moving claw protruding rearward of the holding plate, and the switching lever with the upper end fitted into this fitting hole is pivotally attached to the front side surface of the female mounting base. When the operating end of the switching lever is projected to the front side surface of the overlock sewing unit so that the switching operation can be performed, the movable claw can be supported accurately and firmly, and the switching operation of the winding sewing can be performed on all other parts. To be disturbed by No, there is an advantage that it can be easy in the front side of the sewing machine.

In the sewing machine of the present invention in which an overlock sewing unit is connected as a sewing unit, the overlock sewing unit is provided with a vertical bearing portion at a front position along the connecting end face of the unit, and this bearing portion is also the same. The unit becomes larger than the lockstitch unit when it is pivotally attached to a support shaft standing upright in front of the connection end face of the sewing machine main body so that the unit can be placed away from the bed when not in use. There is no need to carry away the sewing machine when replacing it with another sewing unit. Further, in the next use, the unit can be connected to the sewing machine main body while rotating the unit about the support shaft as a fulcrum, and the labor for attaching and detaching the unit can be reduced.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. The embodiment shown as an example of the most preferred embodiment of the present invention is similar to a conventionally known composite sewing machine and is used for a lock stitch on an arm 1 '. A linear sewing mechanism (not shown), a zigzag sewing mechanism, and a cloth feed adjusting device are provided, and a plurality of thread tensioners 22a and thread guides 22b are provided for overlock sewing.
A sewing machine main body 1 including a sewing machine main body 1 and a sewing machine unit that is detachably connected to the sewing machine main body 1 as a lockstitch unit 2
And the overlock sewing unit 3 are detachably and replaceably provided.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the sewing machine main body 1 vertically separates the left end portion of the bed 1 "at a position where the raising and lowering position of the needle 4 is appropriately biased to the right, and the separating surface is a connecting end surface 5.
As shown in FIGS. 4, 6, and 7, the connection end surface 5 includes at least a shaft joint 7 a of the lower shaft 6 and a shaft joint 9 of the feed adjusting shaft 8.
a, a plurality of fitting portions 10a, 10b, 10c that fit with the two sewing units 2 and 3 side, and a coupling portion 11a of the fastening means 11 that couples with the sewing unit 2 and 3 sides, respectively. It is possible to attach and detach with.

As shown in FIGS. 4 and 6, the lockstitch unit 2 has a needle plate 12 and a feed dog 13 on its upper surface, and a horizontal rotary type in which a hook (not shown) is mounted on the back surface of the needle plate 12. Hook 1
4, a rotary shaft 15a having a shaft joint 7b at one end that meshes with the shaft joint 7a of the lower shaft 6, a bevel gear transmission mechanism 15b, an intermediate shaft 15c, a spiral gear mechanism 15d, and a vertical axis 15e. It is equipped with 15.

Similarly, as shown in FIGS. 4, 5 and 6, in the lockstitch unit 2, the cam 16a fixed to the rotary shaft 15a, the swing rod 16b, and the tip of the feed adjusting shaft 8 also serve as a tone box. A horizontal feed arm 16c having a shaft joint 9a fitted with a shaft joint (tone shaft) 9b that also serves as a tune shaft and the other end connected to a swing rod 16b, a horizontal feed arm 16c, and a feed base 1
7, a horizontal feed mechanism 16 including a forked rod 16d for horizontally feeding the feed dog 13;

A swing rod 18b which is swung by a cam 18a fixed to a rotary shaft 15a, and a swing rod 18b which is connected to the tip of the swing rod 18b and the swing rod 18b, swings the swing rod 18b up and down. A cloth feeding mechanism 19 including a vertical feeding mechanism 18 configured by a connecting rod 18c that is converted into

A body U2 which constitutes the lockstitch unit 2
As shown in FIGS. 4 and 6, the right end face is
Two fitting portions 21a, 21b formed on the connecting end surface 20 of the sewing machine body 1 and protruding forward and backward of the end surface 20 are fitted into the fitting portions 10a, 10b on the sewing machine main body 1 side, and the same connecting end surface 2 is formed.
The non-return tooth type coupling portion 23 protruding to 0 is meshed with the coupling portion 11a of the fastening means 11 on the sewing machine main body side to integrally couple them.

As shown in FIG. 7, the fastening means 11 is provided with a hook-shaped connecting portion 11a connected to the tip thereof so as to be meshed with the check tooth-type connecting portion 23 on the lockstitch unit side. , Swingably in the horizontal direction via a fulcrum shaft 24, and the base end is provided outside the side surface on the other side of the bed 1 ″ and a horizontal shaft 25 ′.
The operation lever 25, which is bent so that it can be bent, and the spring receiver 26 attached to the inner surface of the bed are hooked at one end, and the other end is hooked at the side edge portion of the operation lever 25, and the operation lever 25 is always pulled in the coupling direction. And a traction spring 27 that operates.

When the lockstitch unit 2 is connected to the sewing machine main body 1, the check tooth type coupling portion 23 elastically passes through the tip of the hook-shaped coupling portion 11a biased by the traction spring 27. Then, the traction spring 27 is engaged with the connecting portion 11a, and the traction spring 27 is attracted at a position where the connecting end surfaces 5 and 20 are aligned with each other, whereby the sewing machine body 1 is firmly tightened.

Shaft coupling 7a of the lower shaft 6 on the sewing machine body 1 side
And the shaft coupling 7b of the rotary shaft 15a on the lockstitch unit 2 side
As shown in FIGS. 4 and 6, the disk-shaped groove 28 and the ridge 29 are formed along the diametrical direction of the joint surface of each other.
It is configured so as to be easily attached and detached by engaging with and to efficiently transmit the rotation of the lower shaft 6 to the unit side.

Further, as shown in FIG. 6, the shaft coupling 7a of the lower shaft 6 on the side of the sewing machine main body 1 is provided on the peripheral surface so as to set the rotation stop position of the lower shaft 6 to the raised position of the needle 4. 30 is provided parallel to the axis. Further, as shown in FIG. 7, the positioning lever 3 at the stop position fitted into the slit 30.
1 is swingably supported by a fulcrum shaft 32 along the left side edge of the operating lever 25 and is biased by a spring 33 hung between the operating lever 25 and the operating lever 25 in the uncoupling direction (illustration). When the rotation of the lower shaft 6 reaches a predetermined position, the lower shaft 6 is fitted into the slit 30. Therefore, the position where the needle is raised is the detaching position of the lockstitch unit 2.

Of the plurality of fitting portions 10a, 10b, 10c provided on the sewing machine body 1 side, the fitting portion 1 provided on the front side of the bed.
As shown in FIGS. 4, 6 and 7, reference numeral 0a denotes a bottomed cylindrical hole having a deeper depth than the other, and includes a coil spring 34 which is spring-loaded at the bottom and is fitted with the fitting portion 10a. The side fitting portion 21a is formed in a cylindrical shape having the same diameter. When the operating lever 25 of the fastening means 11 is opened, the coil spring 34 pushes out the fitting portion 21a on the unit side by the restoring force, so that the connecting end surface 20 on the lockstitch unit 2 side is connected to the connecting end surface on the sewing machine main body side. It has a function of separating from 5.

Next, the overlock sewing unit 3 is connected to the connecting end surface 5 of the same sewing machine main body 1 as shown in FIGS. Will be described.

As shown in FIG. 10, the overlock sewing unit 3 is provided with a needle plate 35 for overlock sewing on the upper surface of one body U3, and the feed dog 36 is exposed from between the needle plates 35 to make the needle plate. In the right hand of 35, a fixed pin claw 37 for winding sewing, a moving claw 38 for switching winding sewing, and the fixed knife 3 located on the lower side.
9 and the movable knife 40 located on the upper right side are exposed. Further, adjacent to the movable knife 40, between the front cover 41 that covers the front side of the bed 1 ″ of the sewing machine main body 1,
A knife cover 42 that also serves as a chip removing chute is provided.

Further, as shown in FIG. 10, the overlock sewing unit 3 has the right end face formed on the connecting end face 43 with the sewing machine main body 1, the fitting portion 10a provided with the coil spring 34, and the lock stitch. In the case of the unit 2, two fitting portions 44a and 44c that fit into the fitting portion 10c that is not used are provided in a protruding manner, and a non-return connecting with the joining portion 11a of the joining means 11 is provided at the substantially central portion of the end face 43. As in the case of the lock stitch unit 2, the tooth-shaped connecting portion 45 is projected and fitted into the sewing machine main body 1 and tightened to be integrally connected.

As shown in FIG. 10, the overlock sewing unit 3 has a shaft coupling 7 protruding from the connecting end face 43.
c to the shaft coupling 7a on the sewing machine main body side, and the lockstitch unit 2
11, the rotary shaft 46, which is coupled to the lower shaft 6 by the fitting of the concave groove 28 and the convex line 29 formed on the joint surface, and which transmits the rotation, is shown in FIG. It is rotatably installed horizontally in U3. The rotating shaft 46 is shown in FIG.
From the left to the upper looper cam 46a, horizontal feed cam 46b,
A total of five cams including a female cam 46c, a vertical feed cam 46d, and a lower looper cam 46e are fixed coaxially, and a looper drive mechanism, a knife drive mechanism, a cloth feed drive mechanism, and a difference described later are arranged in the body U3. It is the driving shaft that drives the moving cloth feed mechanism.

As shown in FIGS. 11 and 12, the upper looper 47 includes an upper looper cam 46a, a cam link 48a, a lower swing arm 48b, a lifting rod 48c, and an upper swing lever 4.
The lower looper 49 includes an upper looper drive mechanism 48 composed of 8d, and a lower looper 49 includes a lower looper cam 46e and a cam link 5
0a, swing lever 50b, lower looper drive mechanism 5
0, the back and forth of the needle plate 35 sandwiches the raising / lowering position of the needle 4 and performs a predetermined swinging operation while intersecting with each other like a conventionally known overlock sewing machine.

Lower swing arm 4 of upper looper drive mechanism 48
8b and the tip of the cam link 48a, and the tip of the rocking lever 50b of the lower looper drive mechanism 50 and the tip of the cam link 50a are connected by the spherical bearing 51, respectively, so that the cam link 48a and the cam link 50a are vertically moved. Swing of the upper looper 47 and the lower looper 49 is converted into left and right swing. Further, the mounting shaft 52 of the lower looper 49 for integrally fixing the base portion of the swing lever 50b is horizontally supported, while the mounting shaft 53 of the upper looper 47 is shown in FIG.
As shown in FIG. 3, together with the pivot shaft 54 of the lower swing arm 48b, the upper looper 47 is inclined by approximately 20 ° with respect to the horizontal,
Similarly, as shown in FIG. 13, it is inclined by approximately 20 ° with respect to the vertical.

The provision of the needle 4 that vertically moves up and down with respect to the needle plate 35 is advantageous when performing lock stitching, and the mounting shaft 53 is tilted so that the upper shaft 53 is raised. Inclining the looper 47 with respect to the needle 4 by about 20 ° is advantageous in that the overlock sewing becomes smooth and the sewing machine is easily manufactured. Especially when the sewing machine main body 1 is a compound sewing machine, the sewing machine can be easily manufactured, and both sewing can be performed smoothly and easily.
It is hard to break down.

Similarly, as shown in FIG. 13, the movable knife 40 is slidable in the horizontal direction in the body U3 and is attached to the upper side surface of the knife mount 55 arranged on the front side of the connection end surface 43. Has been. The movable knife 40 includes the knife cam 46c, the cam link 56a, and the lower knife mount 5.
5, a pair of upper and lower swing arms 56 attached to the left side surface
The knife drive mechanism 56 includes b and 56c, and an up-and-down link 56d that is connected between the upper and lower swing arms to convert the swing of the cam link 56a into the up-and-down movement of the movable knife 40.

As shown in FIG. 14, the feed base 57 to which the feed dog 36 is attached has a horizontal feed cam 46b, a cam link 58a, a swing link 58b whose lower end is connected to the tip of the link 58a, and a swing link 58b. Of the dog-legged lever 58c having its lower end connected to the upper end of the feed lever 57c, and the swing of the dog-legged lever 58c connecting the lever 58c and the front end of the feed base 57.
Horizontal feed mechanism 58 including a swing lever 58d for converting the horizontal feed of

As shown in FIGS. 11 and 14, a connecting plate 59a having an L-shaped cross section which moves up and down by contacting the lower surface with the vertical feed cam 46d from above, and a side portion of the connecting plate 59a and a central portion of the feed table 57. Vertical feed cam 46d screwed into the side
Screw 59b for transmitting the vertical movement of the feed to the vertical movement of the feed base 57
A cloth feeding mechanism 6 including a vertical feeding mechanism 59 configured by
Driven to zero.

Further, this overlock sewing unit 3 is
As shown in FIG. 10 and FIG. 14, a differential feed dog 61 is provided at a slight distance in front of the feed dog 36 so that the feeding amount of the cloth to be sewn can be adjusted. The differential feed dog 61, as shown in FIG. 14 and FIG.
Is supported on the left side of the support shaft 62 via a mounting member 63 at the tip of a support shaft 62 slidably inserted in parallel with the feed base 57.

The support shaft 62 has a connecting link 64a whose one end is connected to the side surface of the intermediate portion, a swinging lever 64b which has its upper end connected to the link 64a and which hangs down, and a branching rod 65 which extends below the V-shaped lever 58d. A swinging link 6 in which a base end is pivotally attached to the lower end of the swinging lever, and a fitting element 64c at the tip end is fitted in an arc hole 64b 'for adjusting the feed amount provided in the lower portion of the swinging lever 64b.
4d, a swing arm 64e in which the other end of the support shaft 64c 'of the fitting element 64c is fitted to the forked portion 64e', a fulcrum shaft 66 to which the swing lever 64b is fixed, and the middle of the swing link 64d are connected. The differential horizontal feed mechanism 64 constituted by the two-section link 64f is provided, and the differential feed tooth 61 is horizontally fed in association with the swing of the dogleg lever 58d in the horizontal feed mechanism 58 of the feed tooth 36. To do.

The cloth feed adjusting device 67 for the feed dog 36 is shown in FIG.
As shown in FIG. 4, an operation dial 67a having a peripheral surface facing the front side surface of the overlock sewing unit 3 and a connecting rod 67.
b, the tip of the connecting rod 67b is pivotally attached to the upper end, and as shown in FIG. 15, a swing bracket 67c fixed to the base end of the cloth feed adjusting shaft 69a and fixed to the tip of the cloth feed adjusting shaft 69a. The tone box 67d, the fitting 67e attached to one end of the connecting shaft 69b for connecting the horizontal feed cam link 58a and the swing link 58b, and fitting the tone box 67d to determine the horizontal feed amount, the swing bracket 67c. The rocking bracket 6 includes a click spring 67f for fixing the tilt position.
By changing the angle of 7c, the swing range transmitted from the cam link 58a to the swing link 58b, that is, the cloth feed amount is adjusted.

The differential feed adjusting device 68 is installed in parallel with the cloth feed adjusting device 67, and has an operation dial 68a whose peripheral surface faces the front side surface of the overlock sewing unit 3 and a connecting rod 6.
8b, a swing bracket 68c pivotally attached to the tip of the connecting rod 68b downward and fixed integrally with the fulcrum shaft 66 of the swing lever 64b for differential horizontal feed, and a click for fixing the tilt position of the swing bracket 68c. It is composed of a spring 68d, and moves the fitting 64c in the arcuate hole 64b 'for adjusting the feed amount by changing the inclination angle of the swing bracket 68c and the swing lever 64b via the operation dial 68a and the connecting rod 68b. The swing range of the swing lever 64b is changed to adjust the differential cloth feed amount.

As shown in FIG. 16, the female mounting base 55 has a fixed female shaft 70 having an upper portion penetrating left and right and fixed.
Is slidably supported by a bearing 72 in the body U3 and is movable left and right on the front side in the body U3.
The fixed female shaft 70 includes a pin 70 'provided at the left end and a bearing 7
A coil spring 74 is fitted between the movable female shaft 71 and
Is a cylindrical cam 73 provided at the left end and the knife drive mechanism 5
A coil spring 75 is fitted between the lifting lever 56 and the lifting link 56d in FIG. 6 to support the lever 76 and a stop lever 76 that is constantly urged toward the left side in the drawing and abuts on the left end of the fixed female shaft 70. The moving operation cam 77 always supports the female mount 55 at a predetermined position.

When using the overlock sewing unit 3, for example, when overlock stitching is performed, when the operation dial 78 protruding to the left side surface of the body U3 is rotated, the coil spring 7
Against 4, the movable knife 40 is pressed together and the knife mount 55 integrated with the fixed knife shaft 70 and the fixed knife 39 is moved.

Further, in the case of sewing that does not require a knife, when the operating lever 79 protruding to the left side surface of the body U3 is pushed in, the abutment portion 80 above the lever 78 moves the cylindrical cam 73 to the right. The movable knife 4 in parallel with the movable knife shaft 71.
It is possible to rotate the movable knife shaft 71 and the movable knife 40 toward the front side while being pushed to the right side by being guided by the rod 81 extending from 0 to the cam inclined surface 82 of the same cam 73 and to be placed at the avoidance position. it can.

As shown in FIG. 16, the female mount 55 has a pivot shaft 83 integrally extending from the right side of the lower edge toward the connecting end surface 5 of the sewing machine body 1.
A bearing portion 84 formed on the lower edge of the knife cover 42 also serving as a chip removing chute whose upper side surface is along the outer side surface of the fixed knife 39 is pivotally connected, and is connected to the knife mount 55 so as to integrally move left and right. , Knife cover 42 is movable knife 4
0, the movement of the fixed knife 39 is not disturbed.

Similarly, as shown in FIG. 16, the female cover 4
2 is a bed 1 "adjacent to the right side by a pivot 85
The front cover 41 is pivotally attached at its lower edge.
In the female cover 42, the pin 86 provided on the upper right side surface is fitted into the arc-shaped guide groove 87 provided on the left side surface of the front governor 41 with the pivot axis 85 as the center of the circle, so that the pivot axis 85 is secured. Following the opening and closing of the front cover 41 serving as a fulcrum, the front cover 41 is integrally opened and closed.

Therefore, when the sewing machine main body 1 is used as an overlock sewing machine, when the front cover 41 is opened for threading, the knife cover 42 is simultaneously opened with the pivot shaft 83 as a fulcrum. The threading operation for the upper and lower loopers 47, 49 in the back can be easily performed.

The female mount 55 is shown in FIGS. 16 and 1.
As shown in FIG. 7, an L-shaped bearing surface for slidably supporting a sliding portion 38 ′ integrally extended to the front side from the moving claw 38 for switching winding sewing on the upper end surface. 88 is provided, and a holding plate 89 that guides the sliding portion 38 ′ of the moving claw 38 from the open side (left side in FIG. 16) and the upper surface of the bearing surface 88 is attached to the left side surface of the female mounting base 55.

As shown in FIG. 17, the fitting hole 9 is formed in the sliding portion 38 'of the moving claw 38 protruding rearward of the pressing plate 89.
0 is provided, and the upper end of the switching lever 91 pivotally attached to the front side surface of the lower female attachment base 55 is fitted into the fitting hole 90,
The operation end 91 ′ of the lever 91 is projected to the front side surface of the overlock sewing unit 3 so as to be switchably operable, and at the time of winding sewing, the operation end 91 ′ of the switching lever 91 is pushed down to move for winding sewing switching. The claw 38 can be separated from the fixing pin claw 37 far away. In addition, if the operation end 91 ′ that has been lowered is pushed up,
The moving claw 38 returns.

Since the overlock sewing unit 3 is larger than the lockstitch unit 2 and is heavy in weight, it is difficult to attach and detach the unit when replacing the unit, but as shown in FIG.
A vertical bearing 92 is provided in front of the connecting end face 43 of the overlock sewing unit 3, and the bearing 92 is also provided upright in front of the connecting end face 5 of the sewing machine body 1.
When the unit 3 is not used, it can be placed avoiding the other side of the bed 1 "when the unit 3 is not used, as shown by the imaginary line in the figure, so that the detaching operation at the time of replacement can be facilitated. It will be possible to reduce the labor.

In the case of the second embodiment, each fitting portion 10 facing the connection end surface 5 on the sewing machine body 1 side and the fitting portions 44a, c on the overlock sewing unit 3 side are the support shaft 93.
It goes without saying that fitting and withdrawal from an oblique side can be performed along a rotation locus having a center of circle.

As described above, since the sewing machine main body 1 uses the composite sewing machine, the vertical movement of the needle 4 and the swing movement in the zigzag sewing must be performed during the lock stitch.
In the case of overlock sewing, it is necessary to stop the lateral deflection of the needle 4 and ensure vertical ascent and descent.

Therefore, the sewing machine main body 1 is provided with a needle bar swinging and fixing device 94. As shown in FIGS. 7 and 10, the needle bar swinging and fixing device 94 has a fitting portion 44 on the unit side only when the overlock sewing unit 3 is connected.
The slide rod-shaped contactor 95 is provided so that the left end is exposed in the main body side fitting portion 10c that fits with c, and is retracted by fitting the fitting portion 44c. A link 96a for converting a backward movement into a swing, and a link 96b for converting a swing of the link 96a into a slide,

As shown in FIG. 18, a link 96c for converting the slide of the link 96b into a vertical swing and one end of the link 96c are connected to the link 96c. A plurality of links 96 each including a horizontal link 96d connected to the link 96e provided in the vertical link 96e and a bell crank type link 96f for converting the swing of the vertical link 96e into the swing in the horizontal direction,

As shown in FIG. 19, it is provided at a position adjacent to the needle bar support 97 that gives the swinging width to the needle 4, and normally,
It comprises a coil spring 98 which is biased in a direction away from the needle bar support 97, and is constituted by a stop rod 99 which connects the ends of the bell crank type links 96f.

When the fitting portion 44c of the overlock sewing unit 3 is inserted into the fitting portion 10c, the abutment member 95 is formed.
Is transmitted to the stop rod 99 via the link 96, and the stop rod 99 is inserted into the fitting hole 100 provided at the predetermined position of the needle bar support 97 against the spring 98, so that the overlock sewing unit is pressed. Needle bar 1 automatically when 3 is attached
The lateral shake of 01 is fixed, and the lateral shake of the needle 4 is prevented.

The present invention is not limited to the case where a compound sewing machine is used for the sewing machine main body 1 as in the illustrated embodiment, and for example, whether the main sewing machine unit is connected to the sewing machine main body having a single function of lock sewing. , Or by connecting the overlock sewing unit to the sewing machine body having a single function of overlock sewing, and making it a single-function sewing machine, or by connecting a sewing unit having another sewing function to another single-function sewing machine. In some cases,

In any case, since the sewing machine main body and the sewing unit can be assembled in parallel, the production line is not unified, and the productivity is improved by adopting the tact system, for example. There is also an advantage that the weight of the assembly can be reduced. It is also a design change of the present invention that a plurality of types of sewing units can be detachably and replaceably prepared in one sewing machine main body in addition to the lock stitch or the overlock stitch so that desired sewing can be performed. Belong and is optional.

[0064]

As described above, according to the present invention, the sewing machine main body is
Separate the left side of the bed and the right side of the needle ascending / descending position to form a connecting end face that faces the shaft coupling, the fitting part of the sewing unit, and the connecting means for tightening the sewing machine body and the sewing unit. Since the sewing unit equipped with a predetermined sewing mechanism is detachably connected through this connecting end face, the assembly becomes easy when manufacturing a single-function sewing machine, and when manufacturing a composite sewing machine. By simply connecting the sewing unit having a predetermined single function to the sewing machine main body, desired sewing can be performed and the user can easily use the sewing unit. Also, since the mechanism is incorporated into the sewing unit for each desired sewing function,
The structure is simple, manufacturing is easy, and there are few malfunctions and malfunctions. The present invention has excellent effects as described above.

[Brief description of drawings]

FIG. 1 is a front view of a sewing machine main body showing an embodiment of the present invention.

FIG. 2 is a front view when a lockstitch unit is connected.

FIG. 3 is a left side view when a lockstitch unit is connected.

FIG. 4 is a partially cutaway front view showing an internal structure of a lockstitch unit.

FIG. 5 is a partially cutaway side view showing the internal structure of the lockstitch unit.

FIG. 6 is a partially cutaway plan view showing an internal structure of a lockstitch unit.

FIG. 7 is a partially cutaway plan view when a lockstitch unit is connected.

FIG. 8 is a front view when an overlock sewing unit is connected.

FIG. 9 is a side view when an overlock sewing unit is connected.

FIG. 10 is a partially cutaway plan view when an overlock sewing unit is connected.

FIG. 11 is a partially cutaway front view showing the internal structure of the overlock sewing unit.

FIG. 12 is a partially cutaway front view showing a looper mechanism portion.

FIG. 13 is a partially cutaway side view showing a looper mechanism portion and a knife base portion.

FIG. 14 is a partially cutaway side view showing a cloth feed mechanism portion of an overlock sewing unit.

FIG. 15 is a partially cutaway plan view showing the internal structure of the overlock sewing unit.

FIG. 16 is a partially cutaway front view showing a knife table and a knife cover for removing chips.

FIG. 17 is a partially cutaway side view of a knife base portion and a winding claw switching moving pawl portion.

FIG. 18 is a partially cutaway front view of the swing-fixing device for the needle bar.

FIG. 19 is a partially cutaway side view of the swing-fixing device for the needle bar.

FIG. 20 is a partially cutaway plan view when the overlock sewing unit is rotatable.

[Explanation of symbols]

 1 Sewing machine main body 1'Arm 1 "Bed 2 Lock stitch unit U2 Lock stitch unit body 3 Overlock stitch unit U3 Overlock stitch unit body 4 Needle 5 Body side connection end face 6 Lower shaft 7a Body side shaft joint 7b Sewing unit side shaft joint 7c Overlock Sewing unit side shaft joint 8 Feed adjustment shaft 9a Feed shaft side shaft joint (tune box) 9b Lockstitch unit side shaft joint (tune shaft) 10 Fitting parts a, b, c 11 Fastening means 11a Main body side coupling portion 12 Needle plate for lock stitch 13 Feed tooth for lock stitch 14 Lock hook portion 15 Lock hook drive mechanism 16 Horizontal feed mechanism 17 Feed pad 18 Vertical feed mechanism 19 Cloth feed mechanism 20 Lock stitch unit side connection end face 21 Lockstitch unit side fitting part a, b 22a Thread tension 22b Thread guide 23 Lockstitch unit side coupling part 24 Support point shaft 25 Operation lever 26 Spring receiver 27 Towbar 28 concave groove 29 convex line 30 slit 31 positioning lever 32 fulcrum shaft 33 spring 34 coil spring 35 overlock needle plate 36 for overlock sewing feed dog 37 fixed claw pin 38 moving claw 38 'sliding part 39 fixed knife 40 movable Female 41 Front cover 42 Female cover 43 Overlock sewing unit side connecting end surface 44 Overlock sewing unit side fitting part a, c 45 Overlock sewing unit side connecting part 46 Rotating shaft 46a Upper looper cam 46b Horizontal feed cam 46c Female cam 46d Vertical feed cam 46e Lower looper cam 47 Upper looper 48 Upper looper drive mechanism 49 Lower looper 50 Lower looper drive mechanism 51 Upper looper mounting shaft 52 Spherical joint 53 Lower pivot arm pivot shaft 54 Upper looper mounting shaft 55 Female mount base 56 Drive mechanism 57 Overlock sewing feed table 58 Horizontal feed mechanism 59 Vertical feed mechanism 60 Cloth feed mechanism 61 Differential feed dog 62 Support shaft 64 Differential horizontal feed mechanism 65 Branch rod 66 fulcrum shaft 67 Cloth feed adjusting device 68 Differential feed adjustment Device 69a Cloth feed adjusting shaft 69b Connection shaft 70 Fixed female shaft 71 Movable female shaft 72 Bearing portion 73 Cylindrical cam 74 Coil spring (fixed female shaft side) 75 Coil spring (movable female shaft side) 76 Stop lever 77 Move operation cam 78 Female Platform moving operation dial 79 Movable knife avoiding operation lever 80 Abutment part 81 Rod 82 Cam slope 83 83 Pivot shaft 84 Bearing part 85 Front cover pivot shaft 86 Pin 87 Guide groove 88 Bearing surface 89 Presser plate 90 Fitting hole 91 switching lever 92 vertical bearing portion 93 support shaft 94 needle bar swinging and fixing device 95 contactor 96 Link 97 needle bar support 98 coil spring 99 restraining rod 100 fitting hole 101 needle bar

Claims (15)

[Claims] 1. The left side of the bed is separated at the right side of the ascending / descending position of the needle to form a connection end face, and the lower end shaft joint and / or the cloth feed adjusting shaft shaft joint and the sewing unit are fitted to the connection end face. The sewing machine main body facing the joint portion and the joint portion of the fastening means for the sewing unit is given a predetermined feed operation to the needle plate, feed dog, hook or looper and knife mechanism, and feed dog in one body. The cloth feed mechanism, the hook or the drive mechanism of the looper and the knife mechanism are incorporated, and the right end face of the body is formed on the connecting end face to be joined to the connecting end face of the sewing machine main body. A shaft joint that is detachably connected to the shaft joint of the cloth feed adjusting shaft, a fitting portion that is detachably fitted to the fitting portion on the sewing machine main body side, and a joining portion that is joined to the joining portion of the fastening means. Attached sewing units detachably from each other Sewing machine configured to continue. 2. A lockstitch sewing machine is used for the sewing machine main body, and the sewing unit incorporates a needle plate, a feed dog, a hook, a cloth feed mechanism for giving a predetermined feed operation to the feed dog, and a drive mechanism for the hook. A shaft joint that is detachably connected to the shaft joint of the lower shaft and the shaft joint of the cloth feed adjusting shaft,
2. The sewing machine according to claim 1, which is a lockstitch unit including a fitting portion that is detachably fitted to the fitting portion on the sewing machine main body side, and a joining portion that joins with the joining portion of the fastening means. . 3. An overlock sewing machine is used for the sewing machine main body, and the sewing unit includes a needle plate, a feed dog, a looper and a knife mechanism, a cloth feed mechanism for giving a predetermined feed operation to the feed tooth, a drive mechanism of the looper, A shaft coupling that incorporates a female drive mechanism and that is detachably connected to the shaft coupling of the lower shaft, and a fitting portion that is detachably fitted to the fitting portion of the sewing machine main body, on the connection end surface of the unit. 2. The sewing machine according to claim 1, wherein the sewing machine is an overlock sewing unit including a connecting portion of the fastening means and a connecting portion for connecting the fastening means. 4. The sewing unit, on the connection end surface,
The coupling portion is formed in the shape of a non-return tooth, and the fastening means on the side of the sewing machine that engages with this coupling portion is provided with a hook-shaped coupling portion that hooks the non-return tooth-shaped coupling portion at the tip. Then, the operating lever is provided so as to be swingable in the horizontal direction, and the base end is exposed to the outer surface of the sewing machine main body. It consists of a traction spring that allows elastic passage of the check tooth type coupling part in the insertion direction, and the connection end face of the sewing machine main body and the connection end face of the unit side are attracted to each other by the traction of this traction spring. The sewing machine according to claim 1, wherein: 5. A slit, in which a rotation stop position of the lower shaft is set to a needle rising position, is provided on a peripheral surface of a shaft coupling of the lower shaft on the side of the sewing machine main body in parallel with the axis line, and along the operation lever. A positioning lever for fitting the tip of the slit is provided, and the other end of the lever is brought into contact with the operating lever, and a spring is applied between both levers to swing the positioning lever in the swinging direction of the operating lever. 5. The sewing machine according to claim 4, wherein the stop position of the lower shaft set in the slit is set to the attachment / detachment position of the sewing unit by following the above. 6. The sewing machine body-side shaft coupling and the sewing unit-side shaft coupling each have a disk shape orthogonal to the axis, and have a groove and a ridge formed along the diametrical direction of their joint surfaces. 2. The sewing machine according to claim 1, wherein the rotation of the lower shaft is transmitted to the sewing unit side by meshing with the sewing machine. 7. The fitting portion provided on the sewing machine main body side and the fitting portion provided on the sewing unit side have a round cylindrical body with a tip protruding from a connecting end surface on the sewing unit side, and the same cylindrical body as this cylindrical body. 2. The sewing machine according to claim 1, wherein the sewing machine has a cylindrical hole of which diameter is provided on the side of the sewing machine main body. 8. The cylindrical hole provided on the sewing machine main body side is provided with a coil spring which is spring-loaded at the bottom of the hole, and the restoring force of the coil spring causes the cylinder on the sewing unit side released from the fastening means. 8. The sewing machine according to claim 7, wherein the body is pushed to separate the connecting end surface on the sewing unit side from the sewing machine body side. 9. The sewing machine body is a compound sewing machine capable of performing lock stitch, zigzag stitch, and overlock stitch,
3. The lock stitching unit and the overlock stitching unit are provided so as to be compatible with each other.
And 3 sewing machines. 10. The fitting portion of the overlock sewing unit is provided at a position different from the fitting portion of the lockstitch unit and fitted to the fitting portion on the sewing machine main body side. The inner end of the fitting part of the needle is provided with an abutment that is displaced by fitting of the fitting part of the overlock sewing unit, and this abutment is given a swing width to the needle through several links. It is connected to a stop rod provided adjacent to the bar support, and this stop rod is normally urged by a spring that urges it in a direction away from the needle bar support, and when the overlock sewing unit is connected, it stops against the spring. 10. The sewing machine according to claim 9, further comprising a needle bar swinging and fixing device for advancing the rod to engage with the needle bar support to prevent the needle from swinging. 11. The sewing machine main body is provided with a needle that vertically moves up and down in accordance with a lock stitch and a zigzag stitch, and the overlock sewing unit has a mounting shaft of the upper looper of 20 °.
The sewing machine according to claim 9, wherein the sewing machine is inclined. 12. The overlock sewing unit integrally extends a pivot shaft from a lower end of a female attachment base toward a connection end face side of the sewing machine main body, and an upper side surface of the pivot shaft is attached to the pivot shaft. 4. The sewing machine according to claim 3, wherein a lower edge of a knife cover that also serves as a chip removing chute along the outer surface of the knife is pivotally attached and is connected to the knife mount so as to move left and right integrally. 13. The female cover comprises a front gabber adjacent to the right side face and having a lower edge pivotally attached to the bed by a pivot axis, and a pin provided on an upper right side face of the female cover is provided on a left side face of the front gover. 13. The sewing machine according to claim 12, wherein the sewing machine is configured so as to be integrally opened and closed by being fitted into the guide groove and following the opening and closing of the front cover having the pivot shaft as a fulcrum. 14. The overlock sewing unit has an L-shaped cross-section which slidably supports a sliding portion extending forward from a moving claw for winding sewing switching on an upper end surface of a female mounting base. Surface is provided, and a holding plate that guides the sliding portion of the moving claw from the open side and the upper surface of this bearing surface is attached to the left side surface of the female mounting base, and the sliding movement of the moving claw that protrudes rearward of this holding plate. A fitting hole is provided in the portion, and the switching lever having the upper end fitted in the fitting hole is pivotally attached to the front side surface of the female mounting base, and the operating end of the switching lever is located on the front side of the overlock sewing unit. 4. The sewing machine according to claim 3, wherein the sewing machine is projected on a side surface so as to be switchable. 15. The overlock sewing unit is provided with a vertical bearing portion in the front along the connecting end surface of the unit, and the bearing portion is pivotally attached to a support shaft which is also erected in front of the connecting end surface of the sewing machine main body. 4. The sewing machine according to claim 3, wherein when the unit is not used, the unit can be placed on the other side of the bed while avoiding it.